Device for delaying the opening of the pulse contact for telephone dials

ABSTRACT

A telephone dialing mechanism is provided to produce a delay of two pulses duration before the beginning of the dial pulse train.

United States Patent [54] DEVlCE FOR DELAYlNG THE OPENING OF THE PULSE CONTACT FOR TELEPHONE DlALS 2 Claims, 6 Drawing Figs. 1

[52] US. Cl. 200/33,

[5 l] Int. Cl 1-10lh 43/00 [50] Field of Search 200/33, 1 33.2; 179/90 [56] References Cited UNITED STATES PATENTS 2,963,554 12/1960 Hershey 179/90 3,301,966 1/1967 Bekaert 179/90 Primary Examiner-H. 0. Jones AttorneysC. Cornell Remsen, Jr., Walter J. Baum, Rayson P.

Morris, Percy P. Lantzy. J. Warren Whitesel and Delbert P. Warner ABSTRACT: A telephone dialing mechanism is provided to produce a delay of two pulses duration before the beginning of the dial pulse train.

PATENTEDJAM slsn 3.657.326 SHE-ET IN 2 WWW A Home y DEVICE FOR DELAYING THE OPENING OF THE PULSE CONTACT FOR TELEPHONE DIALS The present invention relates to a device for providing an initial delay in opening the pulse contact opening in telephone dialling discs. It relates more particularly to an improvement on prior art methods for effecting an idle run of said telephone dialling discs before sending out the pulse train.

A preferred embodiment of this invention consists of a mechanism causing an idle run of telephone dialling discs, in which the operation of an electric contact gives rise to pulse emission.

In known dialling discs of the above type, the idle run, before the pulse train, is effected due to the fact that the pulse fork is frictionally rotated from a single lobe cam and through a rest are corresponding approximately to one pulse period, before the drive fork attains the position preceding the start of the pulses. g

In other prior art dialling discs of this general type a rest corresponding to one pulse period has been provided by an arc corresponding to two pulses, one of which occurs before the emission of the pulse train and the other after the emission of the pulse train. In the present invention. by way of contrast, it is our object to provide two idle pulses before the emission of the pulse train.

Novel features and the advantages of the present invention will become more evident from the following description of an exemplary embodiment considered in conjunction with the accompanying drawings; in which:

FIG. 1 shows the starting position (with dialling disc loaded) of portions A. B, C, D, E of the device according to the invention;

FIGS. 2, 3, 4 and 5 show the positions of portions A, B, C, D and E of the device of FIG. 1 during the next movement; and

FIG. 6 shows the final position of the device.

Referring to FIG. 1 the positions of portions A, B, C, D an E of the device are shown when the dialling disc is loaded in its starting position. After releasing the dialling disc (not shown),

cam B begins to rotate clockwise dragging along fork C. The cam B continues rotating until the extension D of l'ork C comes to bear against the short spring of contact A. This causes the fork C to stop (FIG. 2

In FIG. 3, cam B by continuing to rotate causes the movcment of two springs of contact A with the aid of tongue E of the short spring and this results in a clearing ofextension D.

In FIG. 4, fork C during its further rotation, is stopped by the long spring of contact A. In the next step of rotation as shown in FIG. 5. it happens that cam B. through further rotation in contact with tongue E, causes the movement of both springs of contact A and it follows that fork C passes from a position bearing against the long spring to a position bearing against the short spring.

Finally with reference to FIG. 6, it is to be noted the opening of the contact A, which opening is the desired position, is caused by further rotation of the eccentric cam B, to given rise to the first pulse of the pulse train.

As is evident from the foregoing specification, cam B has performed two rotations corresponding to an arc of two idle pulses, which appear before the beginning ofthe pulse train.

It is to be understood that the foregoing description of a specific embodiment of the invention has been given only by way of example and it is not to be considered as a limitation on the scope of the invention.

We claim:

1. In a telephone dialing disc for producing an idle run corresponding to two pulses before emission of a pulse train, a mechanism wherein the improvement comprises a fork having two extensions applied by an eccentric cam and two contact carrying springs, one of which is a short spring having a tongue bearing against the rotating eccentric cam and the other spring is a long spring, said short spring and said long spring being separated after two revolutions of said cam.

2. A telephone dialing disc as claimed in claim 1, in which the mechanism causes the delayed emission of the pulse train after a delay corresponding to two pulses, the latter occurring before the beginning of the pulse train. 

1. In a telephone dialing disc for producing an idle run corresponding to two pulses before emission of a pulse train, a mechanism wherein the improvement comprises a fork having two extensions applied by an eccentric cam and two contact carrying springs, one of which is a short spring having a tongue bearing against the rotating eccentric cam and the other spring is a long spring, said short spring and said long spring being separated after two revolutions of said cam.
 2. A telephone dialing disc as claimed in claim 1, in which the mechanism causes the delayed emission of the pulse train after a delay corresponding to two pulses, the latter occurring before the beginning of the pulse train. 